First thing I would attempt is (at the same menu he mentioned before) at the F8 screen, goto 'Last Known Good Configuration'. Typically if a machine is booting fine one minute, then isn't the next, something got updated on your system. This will effectivly roll back any changes to the system (as long as it wasn't a file getting overwritten). This should always be the first choice if your PC boots, but doesn't load Windows.
If none of the above works (safe mode or LKGC) you may want to get someone who is familiar with computers to make you a
UBCD. This will effectivly give you a running windows OS off of a CD, in which you can backup your files before you have to start anything drastic.
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